Magneto (Michael Fassbender)
This baddie with the power to manipulate magnetic fields has done bad things, but you can't argue with his reasoning. The guy is a Holocaust survivor who lost his family in the camps, and he doesn't want to see his mutant pals suffering the same fate. His tragic past makes him a sympathetic figure, while his present actions against humans are undeniably vicious and evil. How many other X-Men are this complex and nuanced? Oh, that's right: Zero.
The Green Goblin
Norman Osborn, AKA the Green Goblin, is the only guy on this list whose maniacal laugh rivals The Joker's. He was once your everyday millionaire/brilliant scientist, but his secret formula backfired, rendering him mad. He began wearing a goblin mask, flying on a hover-disc, and throwing poisonous gasses at people. But his most brilliant/divisive accomplishment is one that has gone down in comic book history: He murdered Gwen Stacy, Peter Parker's first love.
Mystique (Jennifer Lawrence)
This femme fatale seems to have discovered the Fountain of Youth: Because she can change her appearance, no one knows how old she is. She's used her shapeshifting skills to steal military secrets and weaponry, but no one knows her true motivations. But there is some good — she's acted as foster mother to Rogue, and has even has helped the X-Men. She's an international woman of mystery — something the male-dominated comic world needed.
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The Red Skull (Hugo Weaving)
Johann Shmidt is a villain we love to hate — his crimes are tied to one of the darkest stains in human history. As the Hitler-appointed Head of Nazi Terrorism, Red Skull wreaked havoc on Europe and Captain America. Like Cap, Red Skull was frozen for decades and rescued in modern times, where he continued attempts to kill Cap. He's never succeeded, and even fellow-villain Magneto kicked his anti-Semitic ass for affiliation to Hitler.
Loki (Tom Hiddleston)
If it weren't for Thor's devious half-brother, we'd have no 'Avengers,' and you would have no plans this weekend. The God of Mischief/God of Evil's 'I hate my daddy and brother' syndrome is so intense that he would fight through the ages to usurp them, but he does have one redeeming quality: Despite his appetite for destruction, he will let no harm come to his adopted home of Asgard.